if(${PYTHON_MODULE_EXTENSION} MATCHES "pypy")

  add_custom_target(cpptest)  # Dummy target on PyPy. Embedding is not supported.

  set(_suppress_unused_variable_warning "${DOWNLOAD_CATCH}")

  return()

endif()

find_package(Catch 1.9.3)

if(CATCH_FOUND)

  message(STATUS "Building interpreter tests using Catch v${CATCH_VERSION}")

else()

  message(STATUS "Catch not detected. Interpreter tests will be skipped. Install Catch headers"

                 " manually or use `cmake -DDOWNLOAD_CATCH=1` to fetch them automatically.")

  return()

endif()

add_executable(test_embed

  catch.cpp

  test_interpreter.cpp

)

target_include_directories(test_embed PRIVATE ${CATCH_INCLUDE_DIR})

pybind11_enable_warnings(test_embed)

if(NOT CMAKE_VERSION VERSION_LESS 3.0)

  target_link_libraries(test_embed PRIVATE pybind11::embed)

else()

  target_include_directories(test_embed PRIVATE ${PYBIND11_INCLUDE_DIR} ${PYTHON_INCLUDE_DIRS})

  target_compile_options(test_embed PRIVATE ${PYBIND11_CPP_STANDARD})

  target_link_libraries(test_embed PRIVATE ${PYTHON_LIBRARIES})

endif()

find_package(Threads REQUIRED)

target_link_libraries(test_embed PUBLIC ${CMAKE_THREAD_LIBS_INIT})

add_custom_target(cpptest COMMAND $<TARGET_FILE:test_embed>

                  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})

pybind11_add_module(external_module THIN_LTO external_module.cpp)

set_target_properties(external_module PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})

add_dependencies(cpptest external_module)

add_dependencies(check cpptest)